Improvement in sucker-rod joints



Patented Nov. 29,1876.-

l R 1.3 L I i@ Il lnirwuf 1| c R my wm W. J. LEWIS. STICKER-ROD JOINT.

UNITED STATES PATENT OFFICE;

WILLIAM J. LEWIS, OF PITTSBURG, PENSYLVANIA.

IMPROVEMENT IN SUCKERe-.ROD JOINTS.

Specication forming part of Letters Patent N o. 184,718,y dated November 28, 1876; application flled November 10, 1876.*k`

' Fig. 2 is an outside view ofthe same.

My improvement is designed .for use with the ordinary wooden sucker-rods employed in oil and other bored wells, the ends ofthe rods being represented at 4R R, and the two parts or halves of thejoint are secured together by the ordinary tapped box b and threaded pin 1).' rIhese parts are made each with a rectangular part, d, to which to apply a Wrench in jointing and unjo'inting, as well as in attach- 'ing each part ot' the joint to its rod R. The

outer or' reverse end ot' each halt' of the joint terminates in a threaded screw, s, the threads ofthe screw preferably standing out well on the cylindrical shank or stem, the better to cut or embed themselves into the walls ofthe hole into which they are screwed, so as thereby' to secure the greatest possible holding power as against th'e endwise strain to which .they are subject in use; and while, with the addition ot' a cylindrical ferrule on the end of each rod It, to keep the wood from splitting,I I deem this a sufficiently strong and secure joint for the purpose, I improve its construction by the addition ol' a conical wedge at the base ot' the screw, and a tapering ferrule on the end ot' each rod. This conical wedge is shown at a, and the ferrule at c.

tional strength at the base of the screw, where the greatest danger ot' breakage exists, and also makes provision for securing the ferrule in place without splitting the wood; and to this end the4hole in the end of the rod It is bored smaller than the size ot' the base ot' thewedge a, and the ferrule is made tapering` inward slightly at the end farthest from the end ofthe rod. Then the parts are put together, as represented atB, and the screwing in ofthe screws s is continued until the wedge a enters the end ot' the rod It, and spreads out laterally the end of the rod, so as to make it. Iill the enlarged end ot' the I'errule, as represented at B. I

thus form a dovetail joint on the end of each of' box and pin bp and screws s s, for connecting the same to the wooden sucker-rods, substantially as set forth.

2. The conical wedge a on the base of' the screw s, and tapering t'errule c, in combination with rod R, screw s, and box or pin bp, sub-M stailtially as set forth.

In testimony whereof I have hereunto set my hand.

WILLIAM J. LEWIS.

Witnesses:

W. MACRUM, GEORGE H. CHRISTY.

The conical wedge subserves two purposes: first, it gives addi- 

